ARM: shmobile: r8a7778: Add missing call to shmobile_init_late()

Add the missing call to shmobile_init_late() to r8a7778_init_late().
This should make sure Suspend-to-RAM and CPUIdle are setup as expected
on bockw.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>